Bugs in content types

Hello, starting today early morning, none of the mp4 files that were previously used on my course are usable anymore by the interactive video content. I attach the screenshot of what I get for _any_ video I try to play....  Technical staff in my department suggest it might be a remote problem as nothing has apparently changed locally. I can still download the same mp4 files from moodle repository and play them as ordinary mp4 on my laptop.

This is really critical as students are approching the firts exam and they cannot accest to the content anymore.

Detailed steps to reproduce the bug (exactly how and when did it happen)

If I click on a site link that leads out. Then I go back with the "BACK" button and the plugins do not work. All questions will be displayed at once.
Platform and version number. E.g. Drupal, Wordpress, Moodle.

Wordpress 5.1.
Mobile or Desktop

Desktop
Browser: Chrome, Firefox, Safari etc

Firefox
H5P plugin version

Hi HP5 :)

Today all of a sudden any YouTube video sources linked into to H5P sliders have turned to a monkey holding a hammer. All videos were displaying and playing correctly this morning. Also for those of my colleagues.  We have never had issues previously.

Chrome. PC. Moodle.3.5